Dell 5100cn Color Laser Printer User Manual page 54

6. Insert the four screws provided into the four holes inside the printer and tighten them with a coin to secure the
printer to the optional 1000-sheet tray module.
NOTE: Make sure the screws are firmly tightened.
7. Insert the tray into the printer.
8. Reattach the paper tray cover to the back of the printer.
9. Peel off the peel-off paper on the double-sided adhesive tape on the cable hook, and affix the cable hook on the
back of the printer.